package demo7;
class MyValue{
    public int val;
}

public class Test {
    public static void swap2(MyValue myValue1,MyValue myValue2){
        int tmp = myValue1.val;
        myValue1.val = myValue2.val;
        myValue2.val = tmp;
    }
    public static void main(String[] args) {
        MyValue myValue1 = new MyValue();
        MyValue myValue2 = new MyValue();
        myValue1.val = 10;
        myValue2.val = 20;
        System.out.println("交换前" + myValue1.val);
        System.out.println("交换前" + myValue2.val);
        swap2(myValue1,myValue2);
        System.out.println("交换后" + myValue1.val);
        System.out.println("交换后" + myValue2.val);
    }
}
